Hawzah News Agency – Imam al-Sadiq peace be upon him says:

ارْجُ اللَّهَ رَجاءً لا يُجَرّئُكَ على‏ مَعاصيهِ، وخَفِ اللَّهَ خَوفاً لا يُؤْيِسُكَ مِن رَحمَتِهِ.

'Hope in Allah with such hope that it will not embolden you to disobey Him, and fear Allah with such fear that it will not cause you to despair of His mercy.'

Source: Bihar al-Anwar, v. 70, p. 384, no. 39